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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b03be79df963b02e3ae25df8de301b637fdc30fb761d9b6abdde3766677ad702' 
  AND token = 'jiGttST2nYf6U1d0qFpXW0yo8h6QlpJmSY272m1CRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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