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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4d28100b30d169a34d5c857107c7ef6d1fb8ada1472ec4800e1ab116aa0815f' 
  AND token = '+rk8QXm6eTm40Hb+qXl6BW0e9+maTt5/w12dSvIOE5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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