Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6535c6f70d0e522dbe213a326e766b5a4eed84cbbb2cb8ae1564ba8bc3ef5d' 
  AND token = 'V15djV27jvNwJ2MGB+QFw0dhg1w2eMzlRA+DUbyL1No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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