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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe06e939dc569d65b93a29c4b80d411148933aa08ca60ef9e4f164a968154469' 
  AND token = 'xVY7VZr6So8936Q2trsIzeW8LOn86purAJAjBdJQDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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