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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e3f0d6d7b8aa407d5d0e9936fa26537f8e5fe372b235b540879b22165bbbbc3' 
  AND token = 'eiOQziX+hmHbv9N+MNu7c8ULhjG0TGBv2doEEdOYuuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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