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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c7273f7263e4e665793793559ae4459ff58d79f57b0d9b424804049d4b7cabd' 
  AND token = 'G88aTnlYAFyqvnhqGcOYhgGNdk3AucEsUY8JOrXNNAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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