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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3392b836fcb4f4195b6558b1b3a0b25a584281f1e807d8a8b9979c5b387d9284' 
  AND token = 'EAgqeEHqSy+wX/Ji8E/5f46tWM1OYiX5M2rBgLYXNMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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