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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fe25c09d926f1a71123d9d3eb0beb092c091760922a22d05a653e3d365b70b4' 
  AND token = 'OR/0eEgevO+teRWs5zUtKzkOo/ZWZw6tiBhjNVG8i9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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