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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4ce3dbd6664a6ed46158e4536b87f8174d605dcceb440be9912cbcdfbf8c7ba' 
  AND token = 'WRRb+KSHGEI18S3C0skeEArJMyrc8CAa0gjkVAW++8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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