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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '38b96e32212d5b79ede0e4a7d742f7b4d86ca284cad027e81dc7772efee6d4ea' 
  AND token = 't7xP4Cueja7P1nM789HdYDGAnVcBXMSFB2oZUiv4L7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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