Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8156f83d0b0cdff0fa6451ee18c80cdb4c76bd1bdcbcf32c0a80306800b996d' 
  AND token = '1tybKhpl6FgNxN2+ULsmjPfAWMUKw1NPs2KkPEHbii0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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