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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44c028e4618df4129ac18bba209c5e727670dbd985c7e6bd15c86ce455dc170a' 
  AND token = 'L3De6X5Es69J6YT7UuTcryLwS3ywig846nuhIy5b6Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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