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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a1ce274ce60b15b2b47bea31975f42db902d9140c48978edf53dc22c023fc54' 
  AND token = 'M5qcWBzH9BtrPxAWjhI3GHHfk+nLmm18d6R9oe5Hq+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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