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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4d5e91bede3e00a64fe4e0ec2dc075f42e08c2cfac15781c64ff828acd45b844' 
  AND token = 'tHqCkln9oFF3s6JvboOImhw9xOh/UItPn3hs+y5Y6x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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