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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8df242e079f1f1729e66ea4c22da6696d57634d346d2d18a5429c11dae7ef4a' 
  AND token = '5Fk53PHSiCWrFJ0qn4ETYiwhhXOjpZmUPMkU7glA6g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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