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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e7ccff6226162f119996bac40fccf1e0106cfa6d0575ef87ad4d0b3b91fae57' 
  AND token = 'ps9YLTMW2wBNNkmtGpLbrE3nnesIncwdj0Jro0FTWng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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