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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8c2fc0863f728707151fd0faff0d16a9d2b3dec09fe03c36c4e1557e70a0ebad' 
  AND token = 'Tvh8TftoexMjmmDU9wTZnvh64Ex0XWoaYoReeP5ZUps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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