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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fea2d9a62a33f1de14935a6ef11725899086d817932d0e67fa412d255d78fbff' 
  AND token = '8jV2iy3QiVOVSgQFMsadsO7lMdoUhYyfGxrnsqnuGUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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