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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '88a82d05f4b94071510bf6c60bacd94cc790aeb0e3aa2c325964e6b4cffe68b7' 
  AND token = 'uNKtfoVrz5vRzHSSdyxNw908WPjvKIS7+PgHz9FfuCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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