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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c412e3afa7d5207a7b6956517fe7d51b953f7252786c901f0e2313847bff3239' 
  AND token = 'D4mgDnyGtwkwUTUbs+9qxNEtY0CfpYfl1IUkA6+EQWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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