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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d6ef1de3b0484eec27a7a49d0170ecf89f5aa4d6a500ffd61165f1c8e0bbfc2' 
  AND token = 'XFMpiVza/4PKea7Obp8IDpB+HsNVlNXSje1Z7xASJZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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