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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '444803eb77c2d8aa2b8e89bc6190ed90305c00ed18c9bb369440ef0c1bbf0eb5' 
  AND token = 'HEZBJmXC3lSaWTTGNoFVv4BcSQCPLqCD5bWCKp0gRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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