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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe2ebd1c743084ba7c911400a36b3b6bbdb6548b763762655f96e0cb71d4b8cf' 
  AND token = '91b6ExPfWwrULhiJK4IVWQICFBhbbShk1f2O01Ce9vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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