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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6b9be23ac4d64aeb5572ad6486aa850ea2be8daca7e5a1e2d17bc45b94c75719' 
  AND token = 'OWocOihfl2xO8ziL5VaJwdt9PaA8jMBU0vYeoFc/oSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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