SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '07276aa6d26d79edfea53bff8568e81c327c4dc9568c02c8f3a5ea52d18bae4a' 
  AND token = 'TNqPb/XXJsnR/c2w5uhiJuFIV3VryKSN/+l2bzjY23s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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