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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8bf0b30de02bce44099b1c39e900c55db8f4d62b9eab09ed8ca1d6fc2e2d5ecb' 
  AND token = '50ggeTYet841Pa+BNtrUM4aJDVSCYp0x8ReLdtrhsxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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