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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '282a384facd0800745499f4dcb284c0e1dc26cd06b4dbeb12fd3ce01c72480a7' 
  AND token = 'VdaZHPaYqJsCZJEB+TdIfkcPUoy4MWZbC4xHVo4yAwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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