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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cba2b0658636859b81c4312d89e69b4cbb5ff15c8f8b25db73daadd4e28f3621' 
  AND token = 'aKoVpGyTCBAymFxUztQa7NULgJsANDFFWVqWMxoHEOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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