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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93c87f1d88b5fd41358ffcfbb49f565abdd3b2af48a603aaa4c956184dab5861' 
  AND token = 'nLPIOsB3qny6Y6+51/0oa6Vp8S/HFj72OMt7hf4AqUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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