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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a35fb2d1e129c703a049ac1fcce7c5b67b00f9df1aa43ef31ee9c90d88536c2' 
  AND token = 'zRo8h9kT2nXNmFr9/IIDcCE1ja0VW0a96pPgO2V7By4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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