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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e46339f060158af6a8ed7047bd36ee55cc6c32df3d82551ff2da6e5e271f33ca' 
  AND token = 'wQIFLzgtKgcn0bz8NQsvLwOL2jKCnHuP14AO7dHAtrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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