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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1571e27282b65de3b7de399d098ec1b8aae9f200a1ec6241df485ba0eb8aad1d' 
  AND token = 'xeAmXVtL16stvjd4AS+RfWASp6bIBxApvw9Mr7WDjKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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