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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '205505d6a638a956528d0594e84bdc8d588168aa015bc58343cd82e495f63b0b' 
  AND token = 'wIG2ETWkZ6h8uWn+QfhN58XA1yWmNkLhTb7/6fahsU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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