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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53a61ae5bb238423ed6c0de72f65453d1a0e5ba78022a6ecc0d4860c1b26c7ea' 
  AND token = 'GmVHzCx8kK5dicX5iuG4XHC048NXgNHMSHTafm2szqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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