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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ac2345e83b1eec3d2df89995301bb6ebdf437c038e35d8e03bcec86c585ede45' 
  AND token = '4eMpJh1GLAmAS/bgmwwkN7NeMG8gKU/1SQrED5pmcZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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