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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '27bbcab1bfb45acf04163707ab3d38a4950a7286536bb72b015c069ff76baf47' 
  AND token = 'ZZ3qgLkcpZ6MYROK1GZxysm/vQO88Il1vbn6nO1ez8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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