SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a4612dde7e3902c0b1f465dfa920673254f321be008e43fbf73696350ebf7c6c' 
  AND token = 'u+AJgcmzFjYDvWObbFqA84+4b5MC7vzvuwN8yM3WQus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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