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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c4a6f908930dc390071095d6f332aeff6f40cd3ca704bb8e3e49437df4d8473' 
  AND token = 'tcgAyey4vBcV3lnQq9QJIxhAkS7qhgbLSnjsmJR5qOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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