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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'cb370883e8e9aff909d2621dd7e90d02e1d35c1a892f7c1b112aac2450dc8b62' 
  AND token = 'LQl/7hEhASXsRhp4KNd0KkcIRJYBNj6najmPNHY7yWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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