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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'adb5cda8cd86e072411426e5a224a4db42c1147265d62db853c882bf52b3acec' 
  AND token = 'qVcrCquPdFiXrC4gw5J1vIwre0QSI7NiVQN1FC7tMyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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