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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '53d9955461dc2838606ff87d55a952af6db34b05d94fd2f737d3a169c8f03844' 
  AND token = 'y4+5WschipzxX38PrcDxrxRXZnTVxnP+Fm7qi2aYPEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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