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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e9efdbc6c8b628de5dfa5872010b4548867f32c6a26b50b0c0a58da05bffe54b' 
  AND token = 'hfJn0W4sL5jzG/0afxsgpTHOGSfm4J6vqKKYWzOc9dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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