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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9672be6036cc26ac835f5c78366391a4fd61f38f6d4d3af99d2b036432793393' 
  AND token = '407mWK4JL9YFkcedmJRXODlVXeOo8k6evZdSajpmo4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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