Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b946d994ed1894476d0b5701556cb91f4270420bd6dd7e5c8a8f8931177ef6' 
  AND token = '3DNrrRhexMpRY8nHTeZzV0S1NMUY/EcEQ+TtQkayfAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}