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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '711e612c240f255d2d98c861cb366b123148c211b2cbe9ffb0d25a7b13d6164c' 
  AND token = 'bEFAqplt7T/n7kkMcvRn0oQ1SYfDMspJgdTzDJlj8zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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