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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '487e93de28396b75b9bd14f528e39830ed4181571c7e7cb366f6cecb81433c3f' 
  AND token = 'okUVYeJIpqKuBONZUf3zi0+s4dLw4d9jOoOt9aFr5sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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