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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7165b115eae9e5bc4c4608344458cfdd8eb49e29d505b8541c3a91b563a483b5' 
  AND token = 'P6xACNUnMPRNHUmJ3aUGxiFgvoW12Rdj/jOLTfKf4/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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