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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '635a33dee2a86dc3833dba96117c0ab7abb3ae856a63e9bd8fcbe42ae019fbb5' 
  AND token = 'r9jcnOqXIbQ6/ukQHSXkJO+Bm2ZGnBodYpwvW7v38iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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