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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f70ba020a95cbcbfdc3508fd36b0b3a903ce0f8f398317b628eb5b5cda4c1f30' 
  AND token = 'ScZL4uPukZ8qf5D9VI+MRA/9zGqdqbmZPv9QA7NjwP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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