Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b4d7c04ea68da4792131bd55b2645d0624fe8feb17b885f498df8eec40e392' 
  AND token = 't1duu/zuHJZLPPFRbiiS9sOEdUS0yBqjKROzM/qbmaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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