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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'be94b0dfaa18063c5b8a3db32be57a206445906f916a7434ea4af453867584fc' 
  AND token = 'Y4gyFlk9oh8tf6nZqYhjJXb2TfR+0o/b44i4KJBoBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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