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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4288580e06828947f829ceab206b4907eeb95c45b2a5d122a3c5aeea948c815f' 
  AND token = '53mlNY8c0Mf30qlP21AnzAd5vvEeJMSp4ifX4j6a27U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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