Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea1fc4fa1af50e342beb2df22a5edd114881e21c91eb8536a9c2785cc8bcd64' 
  AND token = 'yLRYq46PDFq1UTR2iDm6jeMiC9P36vrk9ldrJ2/pFyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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