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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7193c66ae4f099cb7b63151935a73aae3e80b66300f1ea98caaaab2a0f2a319e' 
  AND token = '1r/QPeK+I4PUmg7Xr4vPAwV61tQ9qo3s01a018ay4KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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