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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '005fab522ae82d6d1d5b16e448a3720ba1e40c5e5cb115bf1691613712e2a80b' 
  AND token = 'zfUm2kPbh4gGQa5mUmzN+qFdzsAeHzfMZSpjGCAE0QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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