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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1080af37e3eacbaa0866633fcbd396a5fc4f1ae6b56bd052a02741c121cd9c1f' 
  AND token = '3XIgBJkkPJtg0FMjSKqMzn3dUxb6SXDyo9HO0C4uPb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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