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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7711ab11e5e7214900f4a8f1b3707d890a1bd405b9c15985a2034c0e24140b0a' 
  AND token = 'Y+1E1OmztnHy2c7b2XJzZFU1O9pd4b68SQXgKQJGS6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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