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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca6ff7d77c979c99b825a4a24856b86e8a2a914d40fbe926391ca35077a3ecdf' 
  AND token = '1iNgKPyhmJLlDk+tvnXc0cPXY8IXt5oIJc8PKPZBePA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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