Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0cf0c7b03d02c75884d5180c34753cbd5e79ac1a2e3a07ce2178e3c8e2d462' 
  AND token = 'KALGlaqQJXcYVD4gEvoGp6uX2M7T2UvCfK1EOaTA/bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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