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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a47d17e996f5f0eb1012c13eb709189c0f32897f87029e7bc590be1e21fd7a1b' 
  AND token = '0v+/0iBVPvRPmedXXrvHidhZar82/ze1O3b6lQzSVKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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